To preserve water and air quality, Mazda has specified voluntary emission standards stricter than the legal requirements and is ensuring appropriately low emissions of pollutants. In the area of manufacturing, the Company is engaged in a range of initiatives to eliminate or reduce chemical substances that damage the environment.
【Manufacturing】Clean Water Consumption at Mazda’s Four Principal Domestic Sites*1 Reduced by 43.0% Compared with FY March 2012 Levels
With the exception of its Miyoshi Plant, nearly all the water*2 Mazda uses in production processes at the plants and offices in Japan is water for industrial use. The Company does not use subsurface water, as this may cause ground subsidence. Mazda also makes effective use of water by collecting and storing rainwater for use in the Miyoshi Plant.
Furthermore, Mazda is committed to saving clean water consumption at plants and offices. In FY March 2016, the Company introduced water-saving shower caps in handwashing areas throughout the entire Company, and water-saving air-in shower heads in dormitory bathrooms. When discharging wastewater to public waterworks, Mazda maintains voluntary standards stricter than the legal requirements, and manages discharge daily. The Company also ensures wastewater cleanliness by properly treating water used for industrial processes, human hygiene, and other purposes.
Clean Water Consumption at Four Principal Domestic Sites
Overview of Wastewater Treatment System (Hiroshima Plant)
Changan Ford Mazda Engine Co., Ltd., located in Nanjing, China, in 2014 started to change the cooling water in production processes and sprinkling water for green spaces from clean water to recycled wastewater, aiming to reduce the clean water consumption by 50 thousand m3 per year.
Mazda de Mexico Vehicle Operation (MMVO) enjoys a high reputation as the first automobile plant to be granted a local environmental license before the beginning of operations. MMVO established an aeration fountain in the balancing reservoir (containing rainwater) in the plant in 2014. The stirring of the water in the balancing reservoir helps prevent the generation of algae, while the aeration (for mixing air) promotes the decomposition of water-polluting substances.
By implementing these measures, MMVO has improved the quality of its discharged water, and also provided a beautiful to look at fountain. MMVO continues its efforts in treating the wastewater discharged from the production process at the wastewater treatment facility within the plant, and using the recycled water for watering green spaces in the plant. In FY March 2016, the amount of recycled water that MMVO used for watering green spaces in the plant was around 190 thousand m3. By doing this, MMVO significantly reduced its use of well water.
Mazda achieved a 15% reduction compared with 2014 levels to 2.19 m3/unit (2014: 2.58 m3/ unit) by optimizing the water supply control of rinse tanks in the pre-electrodeposition coating treatment process.
*1 Head office (Hiroshima); Miyoshi Plant; Hofu Plant, Nishinoura District; Hofu Plant, Nakanoseki District (including nonmanufacturing areas such as product development)
*2 To ensure compliance with the (in-house) standards regarding wastewater from plants, the Company has changed the use amount of recycled water from 100,000 m3 to 50, 000 m3.
【Manufacturing】Air Pollution Prevention: Actively Adopting Fuels that Reduce Environmental Burdens
Mazda is continuing efforts to reduce the emission of sulfur oxides (SOx), nitrogen oxides (NOx), dust and soot, fine particles, vapors, and volatile organic compounds (VOCs).
In addition, Mazda is shifting the use of fuel oil to that of city gas and makes other efforts to actively adopt materials that reduce the environmental burden.
VOC Reductions: Body-Painting Lines
In FY March 2016, Mazda made steady progress toward achieving the target of reducing VOC emissions from vehicle body paint in body-painting lines to 23.5g /m2 or less.
The target was achieved by reducing VOC emissions in body painting lines to 22.4 g/m2, as a result of various measures. Such measures include the Three Layer Wet Paint System introduced in all plants in Japan and major plants overseas, the Aqua-Tech Paint System that delivers world-leading environmental performance, the introduction of a method for minimizing the overspraying of step-shaped parts (e.g., door opening step parts), and improved efficiency in thinner recovery in cleaning operations.
【Manufacturing】Reducing Emissions of PRTR-Listed Substances
With various efforts, such as improvements to the efficiency of thinner recovery for cleaning operation, in FY March 2016 the amounts of substances that are designated under the PRTR Law*3 released into the water system and the atmosphere decreased by 62% from FY March 1999 levels, to 1,060 tons. Mazda will continue working to reduce emissions of PRTRdesignated substances.
*5 Act on Confirmation, etc. of Release Amounts of Specific Chemical Substances in the Environment and Promotion of Improvements to the Management Thereof. PRTR: Pollutant Release and Transfer Register
Realized High Quality, Low Environmental Impact Water Based Painting through Collaboration
I work as manager of the body-painting lines at the production site in Nanjing, China. In order to address air pollution, we introduced the Aqua- Tech Paint System, a water based painting technology with low environmental impact (VOC*4). The Nanjing Plant became the second site to introduce this painting technology after Ujina Plant No.1 at the Mazda Head Office. We have realized the same paint quality as the Ujina Plant through collaboration with the Head Office. I have mastered knowledge of how to manage the facilities through training at Ujina Plant No.1. I will continue to strengthen cooperation within the Mazda Group and seek to produce high quality cars while reducing the environmental impact.
*4 volatile organic compound
Changan Mazda Automobile Co., Ltd.